How to remove crank arms from a Bosch eBike motor

Some rainy day workshop ramblings. We got some new crank arms from Miranda to fit to our Urban Arrow Family with the Bosch Cargo Line Gen 4 motor.

The Bosch Gen 4 has an ISIS spindle, which is also found on Bosch Gen 2, and some Bafang, Specialized, Brose and Yamaha motors (to name a few).

The Bosch Gen 3 has a Mini ISIS spindle which I will also cover here. This method is also suitable for square taper spindles as fitted to some other Bafang, Tongsheng and Ananda motors.

Tools required:
A small pick
An 8mm Allen or hex key
A crank puller with removable inner driver - I use the Park Tool CWP-7,
An adjustable wrench
A torque wrench that can hit 60Nm
A suitable 8mm hex key socket

00:00 - Intro
00:58 - Method 1: Crank arm with fixed washer (ISIS Spindle)
05:43 - Method 2: Crank arm with exposed spindle (Mini ISIS Spindle)
10:13 - Method 3: Self-extracting crank bolts (ISIS Spindle)
12:53 - Outro

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